ParameterModifier Struct

Definition

Namespace:

System.Reflection

Assembly:

System.Runtime.dll

Source:

ParameterModifier.cs

Attaches a modifier to parameters so that binding can work with parameter signatures in which the types have been modified.

public value class ParameterModifier

public readonly struct ParameterModifier

type ParameterModifier = struct

Public Structure ParameterModifier

Inheritance

Object

ValueType

ParameterModifier

Examples

The following code example shows this for a member that has three string arguments, the first and third of which are passed by reference. Assume that a variable named obj contains a reference to the COM object.

// Create an array containing the arguments.
array<Object^>^ args = {"Argument 1", "Argument 2", "Argument 3" };

// Initialize a ParameterModifier with the number of parameters.
ParameterModifier p = ParameterModifier(3);

// Pass the first and third parameters by reference.
p[0] = true;
p[2] = true;

// The ParameterModifier must be passed as the single element
// of an array.

array<ParameterModifier>^ mods = { p };

// Invoke the method late bound.
obj->GetType()->InvokeMember("MethodName", BindingFlags::InvokeMethod,
     nullptr, obj, args, mods, nullptr, nullptr);

// Create an array containing the arguments.
object[] args = {"Argument 1", "Argument 2", "Argument 3" };

// Initialize a ParameterModifier with the number of parameters.
ParameterModifier p = new ParameterModifier(3);

// Pass the first and third parameters by reference.
p[0] = true;
p[2] = true;

// The ParameterModifier must be passed as the single element
// of an array.
ParameterModifier[] mods = { p };

// Invoke the method late bound.
obj.GetType().InvokeMember("MethodName", BindingFlags.InvokeMethod,
     null, obj, args, mods, null, null);

' Create an array containing the arguments.
Dim args As Object = {"Argument 1", "Argument 2", "Argument 3" }

' Initialize a ParameterModifier with the number of parameters.
Dim p As New ParameterModifier(3)

' Pass the first and third parameters by reference.
p(0) = True
p(2) = True

' The ParameterModifier must be passed as the single element
' of an array.
Dim mods() As ParameterModifier = { p }

' Invoke the method late bound.
obj.GetType().InvokeMember("MethodName", BindingFlags.InvokeMethod, _
     Nothing, obj, args, mods, Nothing, Nothing)

Remarks

The ParameterModifier structure is used with the Type.InvokeMember(String, BindingFlags, Binder, Object, Object[], ParameterModifier[], CultureInfo, String[]) method overload when passing parameters by reference to a COM component that is accessed late bound. The parameters that are to be passed by reference are specified by a single ParameterModifier structure, which must be passed in an array containing a single element. The single ParameterModifier structure in this array must be initialized with the number of parameters in the member that is to be invoked. To indicate which of these parameters are passed by reference, set the value of the Item[] property (the indexer in C#) to true for the index number corresponding to the zero-based position of the parameter.

Constructors

ParameterModifier(Int32)

Initializes a new instance of the ParameterModifier structure representing the specified number of parameters.

Properties

Item[Int32]

Gets or sets a value that specifies whether the parameter at the specified index position is to be modified by the current ParameterModifier.